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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68bfb9906804e5281eadc2876f8fedb9a0279db91e3155d088b1d766f29961d5' 
  AND token = 'jqKMGMG6t2SJ/iVmQqayCk0agnYET5MRHyFygDCt1Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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