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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b65e6072aec492f6d8a69d6cf6c00db1c5f468f0986baaaa8f4f54461e128a29' 
  AND token = 'vtpeUVMnbcYInB0kpWQgCbdHuLNqPsIaZ0xmqXneJHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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