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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87b4e97bc55ce50314daa1bf63e257be32dfa242e23106ca8ba1f2a177e5da61' 
  AND token = 'WXglspLBB/ARJIURARetO0ompqZbMSRS2aDf1QYIJ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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