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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3f29f74cd79fbb80d21e7de8ddd8bff56dff438ff7d05b7140f6649960587c1' 
  AND token = 'tLACEDyqdSXmmPgWXWjR7tescFJuhwf/bHPyNszOiaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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