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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2619dd4f5e3f19a2ddca310e9e5d181530f88084edd65682283ad40e48a0e63d' 
  AND token = 'Fu3v42qko2Z2Txbz6tP3KZEhYArdKhAnL9UAAOonzwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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