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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7eb324bc79209d19ce47635b343d93f6a7a7d7eff50a1537c370c92cb99177e9' 
  AND token = 'HdA/FVc7na5crHF4xU4GYjTD3ZHHrie2cpU5voZxtlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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