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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00e2406ceecec9d0081511c9ffee3accb206b2083216d9fb0884d2efce479943' 
  AND token = 'l85tu+PqzaGQr1h9ydeGnp8tcZOpn94MTaXLMUtlIQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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