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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4525b0b29828c6dd3a9a03b847cc739d26da575b5814735361097126582bdd4f' 
  AND token = '90DJkOG8jYkIM5oAhjWAe61VK5rrt/1JNZGo6DSt93U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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