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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '176093c9f7d81b2c9d686fd70e6637aa876374611acfbc641c5cf9d82046c504' 
  AND token = 'CBbrVBfgu7s5UXLj4DcF750xiu76ghMqpyQyVfXJfFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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