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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70539a528e8609abf075c32175a9367d32d4fd6723b57d9f361b9348d1fd9455' 
  AND token = 'b/uHFL5dSn0QvYDkYa+0JEAQtsRwdC2bSM64iovFfTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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