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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8ee63ffe73f9cff6d05cadb1bcccd55493b5e0b4a5bc6964f4166ab4d96f81d' 
  AND token = 'LkkRw+DzAETwvHhvg+RB6gU+lhUZhL1gND9Wh+sAUyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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