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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '239357fd1c5f71e2c363876ad642e5b8259d339821d3fc6d406120e1610968fd' 
  AND token = 'LcT6viGGSYN7L1cDfSO+HtFR4QcYtY60Q6Tnl1IAAnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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