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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd11db9336ec47e6dd91318261e3c787b3055dd452156820c7ee5801565678244' 
  AND token = 'pyjod2IotnB1jYNeP0Jq5cE5SjAc081e16XylK1EVzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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