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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd034667b48f3096c934d9b4f45d8198055915e4cecfdce45a049ad93db6f06e' 
  AND token = '+8whrPQovxJkvD4FqwN7/PtPQ8lzHOMD5kSwvootduw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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