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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6120cf12fe09a5e4cbdf4b25e9cbed55403d03be6a3af3ecae4e61e692449d55' 
  AND token = '9bKEbgJ5TleCQTR4ivVXvnh4W+NphTIHXgG1uV1NoEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}