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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caee5ab625767183d0a061fda5398490d7583518b3ea7204e2b4b49016b088d5' 
  AND token = 'B4zfQs2ab4v2zBaMj6cPW70P6TSuBFwV5SpnvCtgHs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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