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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15db1ce58b7534fb9bb1e516baf26e1c3b0c5f4c875d612dfcc816d0a996dae3' 
  AND token = '2snazgLmRutqVbbTP2zQn/uutaUaXW/G8jPcQyCdhiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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