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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9caa65ca219c798b399068ddbf433f8ea989e3f505ccc327d599cf8e7bc0b886' 
  AND token = 'dD91YU8XwF3LKFsdTp9hgH9SlmSQ9IdMSsdJ79aIi/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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