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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd507350f55bd0799d8e47b7919b9cbb17535cf05cd9f56a3e7af4efa480b076' 
  AND token = 'X4rFj/F9lWrd6tgExfmZbmlgD0gUjITYNI3BLqek+O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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