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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2928bbbf38e1d812aa6b58f6471c4208126f6d9fb558b65a5a4be2e083fa9f9e' 
  AND token = 'Pvma4QhftptYjF5czvolhwD32/6fi60C2ALepfDLtDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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