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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edf0cb3057a044b1adcb2f158f828f158bd1ac831d0bf68bdf082a9982d98ae7' 
  AND token = 'rq7JXc1hFiVWKgI1YF0oJE9KHfrl057VEsT0Xvb6mlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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