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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2509b9467f366ba015c491bc8cd6eb28c64bd09284b53e2ecb8f3340e009fe33' 
  AND token = 'Thto6PkJfnOP+SzkJbrdH3osGPfg/Bl1EnNZECBy8ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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