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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54dfdcc6ead83aa9ed606c0730c4d7dd3630e1d8d9c0b5528dee1359b5a6086f' 
  AND token = '2UJcA4s1ezcApAXw7VGvHveGG2fOrBJHh8cDIfL8+Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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