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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599d0d335c57232db73a97119cac45dd76bc9e038484edd313ba3467da444e4b' 
  AND token = 'QciJzzcSUt8NpXFERwbBlV6jIlMIK6Kk9GbD561I/Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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