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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36a5ae1be82fbdc7ceeab059815d013b6e2e3c5ec6e5926c11e69e3df148be96' 
  AND token = 'WRSgSQgLd/IjVqGP/YYpTT3RFuYN43vNKYzWHrCcNMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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