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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faaab58e97a14a0762b15101b38249f977930124e57e04c29f6b57ae8052e9ab' 
  AND token = 'gk+qlq/JRS0UWLOSSHE1eFlRqBEDHxxYzaaw42q2lxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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