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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb93b52c0e8712c5bdbaea2fe6b7ed52db3d787b38f55d8f41c0d82b1db2b638' 
  AND token = 'o3C2OAo1C1mWjYrgKJbz/5DUqjtSLaU7Tl5LgScihgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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