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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ea3a819d7db5186d60116699971f65d48188baae80e5ae3714aaf84e01826f3' 
  AND token = 'KFd5QKJcTy6HyQxyojAy1OFc5HgIP13uMFOv5InfNwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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