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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfb0fb2f9072b3dcb055a290f2bbe575edda9926611d04332fb8166b2e9d962d' 
  AND token = 'MJFwT6xN0R3kdLIAodzzzPLkjgRto9O/+VQ3ryIxsGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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