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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8c8a85f864efdce5c4f1e6c66b2a06aa310c9e380c99fab048413f8eda1f27f' 
  AND token = 'XzQuKmsPVE8pVT0xUluLck69isddWAlK1OiQGQtVmDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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