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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62c3f000bcdd6767e3261ac06fac52aeb5398b37123e1d3f4f914c1afd09da09' 
  AND token = 'mlkvjJEBf1VNDuRoee5SnLZC/IkTXvFFeJXlOdJ8FJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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