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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b026d46a1382b7f4063893cdde83241d6cd4192bd00a5c9d5a2d924f22ae8760' 
  AND token = 'vcXxV0EShaU0cHcOZvEhIofm1dFepGrAsu4bcVS9Riw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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