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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6437983543c89191c586b887003a5f8c9786dd300bbd54feafc8eed4c7127f48' 
  AND token = 'n7qSPXogOeeqS5+fLDRQn9m+MJZ7LfHJkHsbwIOMsI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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