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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f55eaeee9b2400d099156793a9b190832d37f7c79f54aeeb88bd042b3f860b3e' 
  AND token = 'THetts1Oud6orGByH6ekb3j8tfe97ThFbmwgttrdi2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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