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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f709ed941f1529ec25c3aed8edff890b55e8b03e56c312974190c9c9572f777d' 
  AND token = 's2Wm+xgHxg/ieGqqh5Bus57xyRdbehl0Prv+4QfE//s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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