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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ffdf585651faa588decff8ea2ce273ea3c8f4685aefa5e8726c1d8cc422274' 
  AND token = 'Tq3GIlet+9Hba8Wy6ol4Z7nU1e0LeTaZ2BNPjS/FII4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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