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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c280ffb3d6fcb670bc83ade6cd1ebb164c4e59249931722026ebe8f90b4207' 
  AND token = '0+WpwzIn5Xbr2FVPgxdfN6/59yHfT+Tv5cmioCYTEiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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