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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06e599a851f8d7bf3b1ac9ddac06c6241ed2729236c414950214d02709c40f9a' 
  AND token = 'Jr+R5tVvSEX8ewOSI09y5N/VWvTVH5Wicj7M7rSTv0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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