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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46e05b3db28ac4fbf991c79ba1fd32e5c901e7b3ae3d50051b0f1543b15c634b' 
  AND token = 'qnz8bBQ3c5cTsLCrgCKZn+Jn720VuchLQdI7/nRb09M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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