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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f25504e298ab02c6ab8b8cc60b573d2bcb7305aa46dce9dc713f1adbd9d8f992' 
  AND token = 'SCS/T5ZGWE7Dns6ccU8FAc76zDaDMsAvrcUGkWO/fjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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