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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e77b6f4b87b2d3b7e8edf196363786a9734ddedf3c09c07f8db6353e1463169' 
  AND token = 'ryNfy2qZT/uUF9ix4z4zX8n4fxRZynTM+yduupay2u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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