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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5192712164580b69bdd861dcbd9be225d900d9d80834d49f0fd8c3052b7fde1' 
  AND token = 'QBuJ4OeNXdYKt0fT+ws98Yd34rk3+YqYiabHssmMQQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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