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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7ab7593204e0ea26797cffdf48c3e6fdb4f7d54dfb134b8aa61bbee2aea6f27' 
  AND token = 'al2JweqIrjClkb0GUpbVfcIfSgO8RbGhlY7QYWbrBFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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