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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ec6024abd5b703567a6af0fb2b781e3fb1da277c3663089fc0ced3cea1fd1fe' 
  AND token = 'WapZ00evIL03d5T3s7+CkswLVV5aP7fb22BLzoZuOms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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