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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd34222680c1178008e62ee75460449d6f0a3fc7a801d869b184aaa1eaa0955a7' 
  AND token = 'V5TefdOrUmyw75jvNIZc/1xJ9rw8RDJfhDAGcMKvb1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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