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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5a3c4134d810c8716966b22ff85ca1fc6076262f17600956b889d285c7c1260' 
  AND token = 'DTiVM8rm82v6Je4azGyKzGUJMbHTWh4/vUXFg0aDJcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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