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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf9cfe5e23f246f899f1c6664e0fd2cb7268e1526f245daea2c0c77b704610d2' 
  AND token = 'NgKzQVc5+emtM7aL1OH0yvh9PEjW9fpEH37+2Vt6msE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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