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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39b78fa15f35ead5f64d3d8b5fb5fc56f28b40ee28a758d83a57bec8e83244ef' 
  AND token = 'l3DCt39HDGmRWl4obLFuzxJ5x7lI2GkiF+HcYZlSJQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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