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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd8dac0ca83af7744fbd2b903599f67e24f8c586690f2a572ded04f30ed1bc49' 
  AND token = 'Jq1KlJ5ltNOnq82mt1BF9QN3YHtaVNRg8q5iM3Dt2W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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