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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff43c54218150ba923ce0a375b612691f08c1fead2494e456ed61e7baca943fe' 
  AND token = '6fI4yZiCNDMipDiYxM1U2HsTeDBcTYf0Anm4jQa/dlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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