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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac6770cd079d39936797c2379d01ade21d5ea534dd08494e6053945bfea11269' 
  AND token = 'CohE7OdhJiVngljXHdczPVBL2ba6ohM0IFNOMbC0CTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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