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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7b01461b5c9b9464f0106214fcf3e84eaeeac622c2a9cf56285ae7ef54b17f5' 
  AND token = 'Vh4Em9bpcaKN6f563b+yPBDlEg5B+5ryvLg/9aqhYtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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