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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c3da03acb4e1199859849bdc5cbc49a631a5d568af4165773c8e1d51cbb8d5f' 
  AND token = 'kuF1jAiks7kRbRTzoaDGptoM5YGHV0W/+dGwLwWz48Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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