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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2fb3b856d1dc29fa57f12c71656ba5f64682a540478cd85b6d07ea1491f7643' 
  AND token = 'ol7i1OI5TPiZHmCaDKgRU4Y6IKlvV0cXRTx3ORDEHGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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