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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3ff3ccf055ec0dbe49b56fb9b94d1a9042d3f590165bab1105123629fe21aa9' 
  AND token = 'Qi0bUJxVnst4FJfKVdPmlhcafZmAjC6+JZ4CIrfjzE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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