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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63e9304a1b5d3525945799878a745e2a7bf41e9b651721ec84551992188b1d8e' 
  AND token = 'TRWHl/Ax5Hl2fwXlLfTcExwjynDMclBDPyOCiR6EqXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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